This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: Raw data doesn’t consist of ratios, but numbers of individuals in a population belonging to each phenotypic class. For example, round X wrinkled F 1 all round X F 2 : 5474 round, 1850 wrinkled (7324 total) If data ¡t 3:1 ratio EXACTLY, expect 5493 round (75%) and 1831 wrinkled (25%) Are actual numbers close enough to expected numbers justify conclusion that this phenotype is controlled by alternate (dominant and recessive) alleles of a single gene? Use chi squared test to determine Incredibly easy fve step program For conducting… Chi Squared Test ¡or Mendelian Ratios 1. State “null hypothesis”: Mendelian ratio is observed (expected iF phenotype is controlled by alternate alleles oF a single gene, or two genes, exhibiting simple dominant/ recessive relationship) 2. Calculate expected number oF progeny in each class predicted by Mendel’s laws, e.g. 3:1 or 9:3:3:1 ratio 3. Calculate 4. Translate chi squared value into a p value = probability that observed results would be obtained iF the hypothesis is true...
View
Full
Document
This note was uploaded on 01/16/2012 for the course BICD 100 taught by Professor Nehring during the Fall '08 term at UCSD.
 Fall '08
 Nehring
 Genetics

Click to edit the document details